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EUROCRYPT
1998
Springer

Divertible Protocols and Atomic Proxy Cryptography

13 years 7 months ago
Divertible Protocols and Atomic Proxy Cryptography
Abstract. First, we introduce the notion of divertibility as a protocol property as opposed to the existing notion as a language property (see Okamoto, Ohta [OO90]). We give a definition of protocol divertibility that applies to arbitrary 2-party protocols and is compatible with Okamoto and Ohta's definition in the case of interactive zero-knowledge proofs. Other important examples falling under the new definition are blind signature protocols. We propose a sufficiency criterion for divertibility that is satisfied by many existing protocols and which, surprisingly, generalizes to cover several protocols not normally associated with divertibility (e.g., Diffie-Hellman key exchange). Next, we introduce atomic proxy cryptography, in which an atomic proxy function, in conjunction with a public proxy key, converts ciphertexts (messages or signatures) for one key into ciphertexts for another. Proxy keys, once generated, may be made public and proxy functions applied in untrusted environ...
Matt Blaze, Gerrit Bleumer, Martin Strauss
Added 05 Aug 2010
Updated 05 Aug 2010
Type Conference
Year 1998
Where EUROCRYPT
Authors Matt Blaze, Gerrit Bleumer, Martin Strauss
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